Mai Xin (Wang Zhener) is exceptionally talented in the field of psychology. She is a master illusionist whose specialty is hypnotism. She can easily read others, but she has been unable to find her own memories from the past. One day, a patient who goes missing becomes the catalyst that pulls her into a dangerous game. Together with Xu Liaoran (Wang Yu), a former cop who is looking for his missing sister, they are stranded inside a subway that is headed for a cliff.